Test Detail

Digital squamous cell carcinoma - Poodle / Giant Schnauzer

Dermatológico · Dog

Breed predisposition to squamous cell carcinoma of the nail bed and digit, described in the Poodle (especially the dark-coated Standard Poodle) and the Giant Schnauzer, among other large, dark-coated breeds. The tumour destroys the nail and the distal phalanx and causes lameness. Metastasis is uncommon (around 4 % at 5 years; Chiu et al. 2022), although it may appear in a lymph node or lung in isolated cases. The association with dark coat suggests a genetic component linked to pigmentation.

Inheritance pattern	Complex breed predisposition (not simple Mendelian)
Gene / Mutation	There is no single causative mutation. An association study in the Standard Poodle identified a copy number variant (CNV) at the KITLG locus associated with the risk of digital squamous carcinoma, with an interaction with MC1R that protects light-coated individuals (Karyadi et al. 2013, PMID 23555311). It is a breed risk marker, not a diagnostic test.
Penetrance	Not applicable as a Mendelian trait: breed predisposition is not inherited in a simple dominant or recessive manner; the risk is population-based and multifactorial.
Code	skvf
Turnaround time	10 days
Price	61,11 €

Incidence

The Standard Poodle (especially dark-coated) and the Giant Schnauzer present a much higher risk than the general dog population (Giant Schnauzer OR ≈57; black Standard Poodle OR ≈11; Chiu et al. 2022, PMID 36325409). In Standard Poodles and Giant Schnauzers, around 56 % develop tumours in other digits. Exact frequencies are not published; age, trauma and environment influence presentation.

Breeder management

- This is not a classic carrier test: the result guides on risk, not on guaranteed affected offspring\n- Avoid breeding dogs with a personal or family history of ungual carcinoma\n- Monitor for the appearance of nail lesions in risk lines and refer to the veterinarian early\n- Do not mate two dogs with a history of tumours of the nail bed

Specialist notes

The differential diagnosis includes ungual infections (bacterial, fungal), trauma and other digital tumours (melanoma, soft tissue sarcoma, nerve sheath tumour). Confirmation is histopathological after digit amputation or biopsy. Radiography of the digit assesses bone destruction; staging includes chest and lymph nodes. The treatment of choice is digit amputation.

References

1. Chiu O, Wilcock BP, Wilcock AE, Edwards AM. (2022) Breed predilections and prognosis for subungual squamous cell carcinoma in dogs. Can Vet J 63:1129-1134. PMID: 36325409
2. Karyadi DM, Karlins E, Decker B, et al. (2013) A copy number variant at the KITLG locus likely confers risk for canine squamous cell carcinoma of the digit. PLoS Genet 9:e1003409. PMID: 23555311
3. O'Brien MG, Berg J, Engler SJ. (1992) Treatment by digital amputation of subungual squamous cell carcinoma in dogs: 21 cases (1987-1988). J Am Vet Med Assoc 201:759-761. PMID: 1399782
4. Belluco S, Brisebard E, Watrelot D, et al. (2013) Digital squamous cell carcinoma in dogs: epidemiological, histological, and immunohistochemical study. Vet Pathol 50:1078-1082. PMID: 23735617

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